fefe07003b
28479f926f21f2a91bec5a06671c60e5b0c55532 qa: Test bitcond shutdown (João Barbosa) 8d3f46ec3938e2ba17654fecacd1d2629f9915fd http: Remove timeout to exit event loop (João Barbosa) e98a9eede2fb48ff33a020acc888cbcd83e24bbf http: Remove unnecessary event_base_loopexit call (João Barbosa) 6b13580f4e3842c11abd9b8bee7255fb2472b6fe http: Unlisten sockets after all workers quit (João Barbosa) 18e968581697078c36a3c3818f8906cf134ccadd http: Send "Connection: close" header if shutdown is requested (João Barbosa) 02e1e4eff6cda0bfc24b455a7c1583394cbff6eb rpc: Add wait argument to stop (João Barbosa) Pull request description: Fixes #11777. Reverts #11006. Replaces #13501. With this change the HTTP server will exit gracefully, meaning that all requests will finish processing and sending the response, even if this means to wait more than 2 seconds (current time allowed to exit the event loop). Another small change is that connections are accepted even when the server is stopping, but HTTP requests are rejected. This can be improved later, especially if chunked replies are implemented. Briefly, before this PR, this is the order or events when a request arrives (RPC `stop`): 1. `bufferevent_disable(..., EV_READ)` 2. `StartShutdown()` 3. `evhttp_del_accept_socket(...)` 4. `ThreadHTTP` terminates (event loop exits) because there are no active or pending events thanks to 1. and 3. 5. client doesn't get the response thanks to 4. This can be verified by applying ```diff // Event loop will exit after current HTTP requests have been handled, so // this reply will get back to the client. StartShutdown(); + MilliSleep(2000); return "Bitcoin server stopping"; } ``` and checking the log output: ``` Received a POST request for / from 127.0.0.1:62443 ThreadRPCServer method=stop user=__cookie__ Interrupting HTTP server ** Exited http event loop Interrupting HTTP RPC server Interrupting RPC tor: Thread interrupt Shutdown: In progress... torcontrol thread exit Stopping HTTP RPC server addcon thread exit opencon thread exit Unregistering HTTP handler for / (exactmatch 1) Unregistering HTTP handler for /wallet/ (exactmatch 0) Stopping RPC RPC stopped. Stopping HTTP server Waiting for HTTP worker threads to exit msghand thread exit net thread exit ... sleep 2 seconds ... Waiting for HTTP event thread to exit Stopped HTTP server ``` For this reason point 3. is moved right after all HTTP workers quit. In that moment HTTP replies are queued in the event loop which keeps spinning util all connections are closed. In order to trigger the server side close with keep alive connections (implicit in HTTP/1.1) the header `Connection: close` is sent if shutdown was requested. This can be tested by ``` bitcoind -regtest nc localhost 18443 POST / HTTP/1.1 Authorization: Basic ... Content-Type: application/json Content-Length: 44 {"jsonrpc": "2.0","method":"stop","id":123} ``` Summing up, this PR: - removes explicit event loop exit — event loop exits once there are no active or pending events - changes the moment the listening sockets are removed — explained above - sends header `Connection: close` on active requests when shutdown was requested which is relevant when it's a persistent connection (default in HTTP 1.1) — libevent is aware of this header and closes the connection gracefully - removes event loop explicit break after 2 seconds timeout Tree-SHA512: 4dac1e86abe388697c1e2dedbf31fb36a394cfafe5e64eadbf6ed01d829542785a8c3b91d1ab680d3f03f912d14fc87176428041141441d25dcb6c98a1e069d8 |
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| functional | ||
| util | ||
| config.ini.in | ||
| README.md | ||
This directory contains integration tests that test dashd and its utilities in their entirety. It does not contain unit tests, which can be found in /src/test, /src/wallet/test, etc.
There are currently two sets of tests in this directory:
- functional which test the functionality of dashd and dash-qt by interacting with them through the RPC and P2P interfaces.
- util which tests the dash utilities, currently only dash-tx.
The util tests are run as part of make check target. The functional
tests are run by the travis continuous build process whenever a pull
request is opened. Both sets of tests can also be run locally.
Running tests locally
Build for your system first. Be sure to enable wallet, utils and daemon when you configure. Tests will not run otherwise.
Functional tests
Dependencies
The ZMQ functional test requires a python ZMQ library. To install it:
- on Unix, run
sudo apt-get install python3-zmq - on mac OS, run
pip3 install pyzmq
Running the tests
Individual tests can be run by directly calling the test script, eg:
test/functional/wallet-hd.py
or can be run through the test_runner harness, eg:
test/functional/test_runner.py wallet-hd.py
You can run any combination (incl. duplicates) of tests by calling:
test/functional/test_runner.py <testname1> <testname2> <testname3> ...
Run the regression test suite with:
test/functional/test_runner.py
Run all possible tests with
test/functional/test_runner.py --extended
By default, up to 4 tests will be run in parallel by test_runner. To specify
how many jobs to run, append --jobs=n
The individual tests and the test_runner harness have many command-line
options. Run test_runner.py -h to see them all.
Troubleshooting and debugging test failures
Resource contention
The P2P and RPC ports used by the dashd nodes-under-test are chosen to make conflicts with other processes unlikely. However, if there is another dashd process running on the system (perhaps from a previous test which hasn't successfully killed all its dashd nodes), then there may be a port conflict which will cause the test to fail. It is recommended that you run the tests on a system where no other dashd processes are running.
On linux, the test_framework will warn if there is another dashd process running when the tests are started.
If there are zombie dashd processes after test failure, you can kill them by running the following commands. Note that these commands will kill all dashd processes running on the system, so should not be used if any non-test dashd processes are being run.
killall dashd
or
pkill -9 dashd
Data directory cache
A pre-mined blockchain with 200 blocks is generated the first time a functional test is run and is stored in test/cache. This speeds up test startup times since new blockchains don't need to be generated for each test. However, the cache may get into a bad state, in which case tests will fail. If this happens, remove the cache directory (and make sure dashd processes are stopped as above):
rm -rf cache
killall dashd
Test logging
The tests contain logging at different levels (debug, info, warning, etc). By default:
- when run through the test_runner harness, all logs are written to
test_framework.logand no logs are output to the console. - when run directly, all logs are written to
test_framework.logand INFO level and above are output to the console. - when run on Travis, no logs are output to the console. However, if a test
fails, the
test_framework.logand dashddebug.logs will all be dumped to the console to help troubleshooting.
To change the level of logs output to the console, use the -l command line
argument.
test_framework.log and dashd debug.logs can be combined into a single
aggregate log by running the combine_logs.py script. The output can be plain
text, colorized text or html. For example:
combine_logs.py -c <test data directory> | less -r
will pipe the colorized logs from the test into less.
Use --tracerpc to trace out all the RPC calls and responses to the console. For
some tests (eg any that use submitblock to submit a full block over RPC),
this can result in a lot of screen output.
By default, the test data directory will be deleted after a successful run.
Use --nocleanup to leave the test data directory intact. The test data
directory is never deleted after a failed test.
Attaching a debugger
A python debugger can be attached to tests at any point. Just add the line:
import pdb; pdb.set_trace()
anywhere in the test. You will then be able to inspect variables, as well as call methods that interact with the dashd nodes-under-test.
If further introspection of the dashd instances themselves becomes
necessary, this can be accomplished by first setting a pdb breakpoint
at an appropriate location, running the test to that point, then using
gdb to attach to the process and debug.
For instance, to attach to self.node[1] during a run:
2017-06-27 14:13:56.686000 TestFramework (INFO): Initializing test directory /tmp/user/1000/testo9vsdjo3
use the directory path to get the pid from the pid file:
cat /tmp/user/1000/testo9vsdjo3/node1/regtest/dashd.pid
gdb /home/example/dashd <pid>
Note: gdb attach step may require sudo
Util tests
Util tests can be run locally by running test/util/bitcoin-util-test.py.
Use the -v option for verbose output.
Writing functional tests
You are encouraged to write functional tests for new or existing features. Further information about the functional test framework and individual tests is found in test/functional.